NullPointerException on getBoxes in files containing Apple metadata

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Open a file containing boxes of any AbstractAppleMetaData subclass (I used 
the 720p Serenity trailer from http://www.h264info.com/clips.html)
2. Do a recursive getBoxes call for any non-Apple box type (e.g. TrackBox)

What is the expected output? What do you see instead?

Expect the correct boxes to be returned. Instead, a null pointer exception 
occurs at AbstractContainerBox.java:82 while processing (in my case) an 
AppleStandardGenreBox.


What version of the product are you using? On what operating system?

isoparser 1.0-RC-15 from Maven on OS X 1.8.2


Please provide any additional information below.

Original issue reported on code.google.com by michael....@toushay.com on 17 Apr 2013 at 2:28